Q1 which of the ofllowing hazardous warming labels should appear on a bottle of Na metal ?
A carcinogenic
B explosive
C oxidizing
D toxic
Why the answer is A but NOT B?
Q2
sodium chloride crystal is formed during evaporation of seawater
Why this statement is wrong?
don't NaCI is formed when its saturated solution cool down?
2006-12-31 08:03:45 · 1 個解答 · 發問者 2003 2 in 科學 ➔ 化學
Q.1
All the four options are incorrect.
Usually, a flammable label is stuck on the bottle of sodium. Actually, it is the warning label for paraffin oil in which sodium is stored.
Q.2
Only powder (amorphous form) of sodium chloride is obtained when seawater is evaporated to dryness.
Crystallization (Slow cooling down of saturated sodium chloride solution) is used to obtain sodium chloride crystals.
2006-12-31 21:53:58 · answer #1 · answered by Uncle Michael 7 · 0⤊ 0⤋